Bikeboats
Steve @ Dinosaurs and Robots writes –

I’m introducing my kids to the ancient sport of Unlimited Bicycle Hydroplane Street Racing. Traditionally, these boats were in built in July and August with wood scavenged from suburban construction sites and cobbled together by unsupervised kids who borrowed their dads tools and made their own fun.

Traditional Bike-Drawn Pavement Hydros – [via] Race a thunderboat behind your bike!